Boiler



M. E. HERBERT.

- BOILER.

APPLICATION FILED JUNE 28,19l8.

1,32Q690. Patented Nov. 4, 1919.

2 SHEETS-SH,EET l.

} WITNESSES A rromvns INVENTOR M. E. HERBERT.

BOILER.

APPLICATION FILED IUNE 28. rats.

Patented Nov. 4, 1919.

2 SHEETS-SHEET 2.

W! T/VESSES A TTORIVEVS MICHAEL E. HERBERT, OF CHICAGO, ILLINOIS.

BOILER.

Specification of Letters Patent.

PatentedNov. 4, 1919.

Application filed June 28, 1918. Serial No. 242,465.

To all whom it may concern:

Be it known that I, MICHAEL E. HERBERT, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boilers, of which the following is a specification.

My invention is an improvement in boilers, and has for its object to provide a boiler of the character specified so arranged that the water therein will receive a maximum amount of heat from the fuel consumed, insuring economy in the consumption of fuel.

In the drawings:

Figure 1 is a perspective view of the boiler, with parts broken away;

Fig. 2 is a perspective view of one of the water tube sections, with a portion of the refractory covering removed;

Fig. 3 is a longitudinal vertical section of the same;

Fig. 4 is a transverse vertical section through one of the water legs.

In the present embodiment of the invention an outer shell or casing 1 is provided,

having the usual cast base 2, which is provided with the ash pit door 3, and the cleanout door 4, the latter being at the rear of the base while the former is at the front. An inner .shell 5 is arranged within the outer shell in spaced relation, the said shells being rigidly connected by the usual rivets 6, and this inner shell 5 has near the front thereof a depressed portion 6 forming a transverse water leg between the magazine 7 for the fuel, which is at the front of the inner shell, and the space for the water tubes, which are at the rear of the shell.

A passage is provided through the space between the shells at the front thereof for the insertion of fuel to the magazine, and this passage is closed by a door 8. A grate 9 is arranged between the base and the shells, extending from the front of the inner shell to the bridge wall 10, and a series of tube sections is arranged in the rear and above the wall, the said sections communicating with the water chamber between the shells. This water chamber has wash-out plugs 11 at the front of the outer shell, and a return pipe connection 12 at the rear and at one side, and the smoke chamber in which the tube sections are arranged has a draft tube 13 at the rear of the shell, the said tube having a clean-out door 14 at its lower part. The bridge wall 10 extends slightly above the grate level and a water leg 15 is arranged upon the wall, the said leg forming a grate between the fuel on the grate and the chamber at the rear of the said leg.

As shown in Figs. 2 to 4, inclusive, each of the tube sections consists of a pair of casings 16 and 17 of substantially reotan gular cross section, each section having a transverse horizontal partition 18 at approximately its center, dividing the said casing into upper and lower compartments.

A series of water tubes 19 connect the corresponding chambers of each casing, and each casing is provided at one end at the upper compartment with a nipple 20, and at the other end at the lowermost compartment with a second nipple 21; These nipples are oppositely arranged at the two casings, the arrangement being such that the water may flow, for instance, into the casing 16 through the nipple 20, through the tubes 19 of the upper series and into the upper compartment of the casing 17 from where it flows out through the nipple 20 to the water chamber.

Each of the tube sections is covered by a layer 22 of refractory material, as, for instance, fire brick tile, the said tile being of a depth to come flush with the upper faces of the casings 16 and 17, and the said tile is laid directly upon the upper series of tubes. Each casing 16 and 17 is provided in its outer wall with openings in alinement with the tubes 19, and each of these openings is closed by a plug 23. These plugs are cleaning plugs, permitting access to the respective tubes. A passage leads from the front of the casing 1 to the space above the grate, the said passage being a clinker passage, and is normally closed by a door 2 1. The front wall of the water leg 6 has vertical grooves or corrugations 25 providing passages for gas.

In operation, the heated gases passing from the burning fuel on the grate move in contact with the surface of the water leg 15 and with the inner surface of the shell 5, and with the water tubes 19 and the casings 16 and 17 giving up their heat to said shells, legs, tubes and casings and heating the water circulating therein. The water may pass through the casing 16 and the tubes 19 and the casing 17, and will be thoroughly heated, taking up the greater part of the heat from the heated gases. A water leg 15 is connected to the water chamber between the shells, and there will be a continuous circulation of water, the heated water rising to the top while the cold water descends to be heated in turn.

I claim:

1. In a boiler, inner and outer shells idly connected in spaced relation to form a water chamber between them, a bridge wall extending transversely of the inner shell and, dividing the interior of the shell into a combustion chamber and'a heating chamber, a water leg lying on the bridge wall and communicating with the water chamber at its I end, the inner shell bending downwardly to near the grate and then upwardly between the water leg and the front of the inner shell toform a ma azine wall, and water tubes arranged withln the heating chamber and communicating with the water chamber, said tubes being arranged in sections, each section consisting of casings divided horizontally into upper and lower compartments, theupper compartment of each casing communicating at one end of the casing with the water chamber and the lower com partment of each casing communicating at the other end with the water chamber, and a series of water tubes connecting the cor L responding chambers of each casing, the arrangement of the connectlons of each casing being opposite to those of the other casing. 2.- In a boiler having a water chamber,

water tube sections, each section consisting water chamber, the arrangement of the connections of one casing being opposite to the arrangement of the connections of the other casing.

MICHAEL E. HERBERT.

Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. I 

